Control of Nano-Precipitates in Age-Hardenable Aluminum Alloys and Their Mechanical Properties

Tatsuo Sato; Shoichi Hirosawa

doi:10.4028/www.scientific.net/MSF.475-479.337

Paper Titles

Production and Mechanical Properties of In-Situ Ti Alloying A356 Alloys
p.321

Thermodynamics-Based Constituent Design of Lithium Containing 7000 Series Aluminum Alloys
p.325

Mechanical Characteristic of Flowing Solidification under the Extrusion for the Mixture of the Liquid Aluminum with Sillimanite Particles
p.329

Compressive Properties and Energy Absorption of Hollow Sphere Aluminum
p.333

Control of Nano-Precipitates in Age-Hardenable Aluminum Alloys and Their Mechanical Properties
p.337

High Speed Roll Casting of Aluminum Alloy Strip
p.343

Interfacial Reaction and Strength of Dissimilar Joints of Aluminum Alloys to Steels for Automobile
p.349

Microstructures and Thermal Stability of the Metastable-Phase Precipitates Formed in an Al-Cu Alloy
p.353

Nano-Scale Clusters Formed in the Early Stage of Phase Decomposition of Al-Mg-Si Alloys
p.357

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Control of Nano-Precipitates in Age-Hardenable Aluminum Alloys and Their Mechanical Properties

Abstract:

The nano-scale precipitate microstructures and properties of age-hardenable aluminum alloys such as Al-Cu, Al-Mg-Si and Al-Zn-Mg alloys were investigated using conventional electrical resistivity and hardness measurements, TEM and 3D-AP techniques. To increase mechanical strength and ductility of the alloys nano-scale precipitates were effectively controlled by applying new type heat treatments and microalloying elements. In the initial stage of phase decomposition of the alloys containing microalloying elements several types of nanoclusters were formed and distinctly detected by the 3D-AP technique. These nanoclusters greatly affect the nucleation of the subsequent precipitates and resultantly mechanical properties. In Al-Mg-Si and Al-Zn-Mg alloys complicated two-step aging behaviors were found to be originated in the positive or negative effect of the nanoclusters with different structures.